package com.itheima.filter;


import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpResponse;
import org.springframework.util.StringUtils;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
//@WebFilter(urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest req  = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
        //1,获取请求的url
        String url = req.getRequestURI().toString();
        System.out.println("请求的url");

        //2,判断请求url中是否包含login，如果包含就是登录操作，放行
        if(url.contains("login")){
            log.info("登录操作，放行。。。");
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }

        //3，获取请求头中的令牌
        String jwt = req.getHeader("token");



        //4，判断令牌是否存在，如果不存在，返回错误结果
        if(!StringUtils.hasLength(jwt)){
            log.info("请求头token为空，返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转换，将对象——》json    引用阿里巴巴的fastJSON、
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return;
        }

        //5，解析token，如果解析失败，返回错误结果
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            e.printStackTrace();
            log.info("解析令牌失败，返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转换，将对象——》json    引用阿里巴巴的fastJSON、
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return;
        }

        //6，如果解析成功，放行
        log.info("令牌合法，放行");
        filterChain.doFilter(servletRequest,servletResponse);

    }
}
